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DRAWING ANGLES WITH SET SQUARES

V. Ryan 2008

 

Set squares are used in conjunction with T-squares to draw accurate angles. There are two main types of set square. One has an angle of 45 degrees and the other 30/60 degree angles.

 
 
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The 45 degree set square also has a 90 degree angle. This can be used for drawing vertical lines.

 

The 30/60 degree set square also has a 90 degree angle. This set square can be used to draw 30, 60 or 90 degrees angles.

 

Set squares are only accurate if they are used along with a T-square. The set square must rest on the T-square which should be pushed against the edge of the board. If the T-square is not right against the edge of the board (if there are even small gaps) lines drawn at an angle will not be accurate.

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Common errors when using T-squares and set squares are that gaps are allowed to develop between the T-square and the edge of the board or the set square and the T-square. This leads to inaccurate drawing with angles being incorrect.

 
 

Set up a piece of A4 paper on a drawing board using a T-square to ensure the paper positioned correctly. Use clips to fix the paper to the board. Draw a border and title block with the title being 30 DEGREES ANGLES. Place the title at the top of the page as well, in larger BLOCK CAPITALS.

Draw a number of lines at 30 degrees and then ‘flip’ the set square round to draw 30 degree lines in the opposite direction.

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Draw a number of lines at 60 degrees and then ‘flip’ the set square round to draw 60 degree  lines in the opposite direction.

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Adjustable set squares allow a range of angles to be drawn accurately. They can be adjusted to a variety of angles which means only one set square is required. It must still be used by resting accurately on a T-square.

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